<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>react生命周期(旧)</title>
  </head>
  <body>
    <!-- 准备好一个容器 -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script src="../js/react.development.js"></script>

    <!-- 引入react-dom用于支持react操作DOM  -->
    <script src="../js/react-dom.development.js"></script>

    <!-- 引用bable,用于将jsx转为js -->
    <script src="../js/babel.min.js"></script>

    <script type="text/babel">
      // 创建组件
      class Count extends React.Component {
        state = {
          count: 0,
        }

        add = () => {
          const { count } = this.state
          this.setState({ count: count + 1 })
        }
        render() {
          const { count } = this.state
          return (
            <div>
              <h2>求和的结果为：{count}</h2>
              <button onClick={this.add}>点我+1</button>
            </div>
          )
        }
      }

      // 渲染组件到页面
      ReactDOM.render(<Count />, document.getElementById('test'))
    </script>
  </body>
</html>
